Table 3.

Percent difference between calculated and measured monitor units for beams of energy 6, 9, 12, 16 and 20 MeV for cutout sizes of 5, 4, 3, 2 and 1 cm in water at 100 cm SSD using $10\times 10{\text{cm}}^2$ cone.

		Electron Beam Energies
Cutout size	6 MeV	9 MeV	12 MeV	16 MeV	20 MeV
5 cm	1.2	0.5	0.3	0.0	1.4
4 cm	1.9	1.6	0.4	0.5	1.5
3 cm	1.2	0.6	1.2	1.2	2.4
2 cm	3.9	4.3	4.7	2.6	3.9
1 cm	43.5	34.3	24.9	13.5	8.2